Diestock



1. KONIGSQBYERG.

DIESTOCK.

APPLICATION FILED AUG-24, 1920.

1,42 3,945. at ted July 25, 1922.

2 SHEETS-SHEET I.

J. 'KONIGSBER G.

DIESTOCK.

APPLICATION FILED AUG.24. 1920.

Patented July 25, 1922.

2 SHEETS-SHEET 2.

Ira/671a 1* W M {TATE-S; PATENT OFFICE...

JOSEPH-KONIGSBERG, 013. NEW YORK, N. Y., ASSIGNOR TO LENA KONIGSBERG, OF

NEW YORK, N. Y.

DIESTOCK.

Another object is to provide a structure having one centering devicelocated at a distance from thecutting chasers and another centeringdevice located between the first named device and immediately in frontof the cutting chasers.

Another object is to provide anintermediatecentering device having aplurality radially movable arms, a common means for actuating the armsand a means for maintaining them in a fixed relative position.

Another object is to provide certain improvements in the form,construction and arrangement of the several parts whereby the abovenamedand other objects may be effectively attained.

A practical embodiment of my invention c represented in the acompanyingdrawstock having my ings, in which i Fig. 1. represents a plan View ofav die improved centering devicesappliedthereto.

- Fig. 2 represents afront elevation of the same, 7

Fig. represents a verticalsection taken in the plane of the lineTIL-IIIctFig. 1, looking in the directiOnotthe arrows.

Fig; 4 represents a rear elevation of the die Stock, portions of itbeing brolren away to show more clearly the parts within, and Fig. 5represents a vertical central; section taken in the plane ofthe line VV'of Fig.

1, looking-in the direction-ofthe arrows.

The die stock to which my improved centering devices are appliedeis ofwell-known and. approved construction and I deem it immediately infrontof the cutting chasersnecessary to describe only such parts as willgive a clear understanding of'the application-of my: invention thereto.

Specification of Letters Patent.

PatentedJuly 25, 1922.

Application filedAugust 24, 1920. SerialNo. 405,574.

The diehead is denoted by 1-, thecutting chasers by 2 and the leaderscrew in the form of a barrel by 3.

One pipe centering device comprises a frame 4 carrying radially movableguide blocks 5, in' the-present instance three are shown, located at'adistance in advance of the cutting chasers 2, andlascrew threaded nut 6which is arranged to travel on the leader screw 3.

Acam plate 7 is secured in rotatable adjustment on the frame a, and isprovided with eccentric segments 8 arranged to slide in slots-9 in theblocks 5, and thereby control the radial movement of thebloeks, The

cam plate 7 is rotatably'secured'on the frame 4 bymeans of aratchet-wheel 10, which is threaded on a tubular hub 11 formed integralwith the frame 4, and fixed against rotation by a screw 12, which passesradially through the ratchet-wheel and threaded into the hub 11 Toprovide for a rotary adjustment of the ratchet-wheel- 10, thehub 11 hasa series of screw threaded holes 13, asshown in. Fig. 4:. 1

In order to lock the cam plate 7 and blocks 5 in a relatively fixedposition, the cam plate is provided with a laterallyextendinglug 14 inwhich is positioned'a pawl 15 arranged to engage the ratchet-wheel 10.

The shank 16 of the pawl 15- is screw threaded to receive athumb nut 17which is adapted toengagethelug-leto take up any lost motion between thepawl and ratchetwheeland hold the cam plate and blocks against movement.

The leader screw barrel 3, in the present instance, is shown secured tothe die head 1 by means o-fscrews 18threaded into ears 19 on the leaderscrew barrel; The securing of the leader screwbarrel tothe die head isnot an, essential feature toward the successful operation of may beformed integral with the die head and'providedwith means other thanbeing screw threaded by which the I frame; ii: of the centeringdeviceabovedescribed may be retained.

A second pipe centering deviceis located 2' and comprises acup-shapedring 20 carry ing radially swinging-curved arms- 21, each myinvention, since the barrel of which is pivoted at 22 and arranged toswing through curved guide slots 23 in the leader screw barrel 3 oneside of each of which slot bears against the arms to guide them inmovement and hold them in position in contact with the pipe. The ring 20is retained '1 rotatable adjustment against the die head 1 by means of aratchet-wheel 24;. which is screw threaded on the barrel 3. The ring '20with its arms 21 is locked in a fixed relative position by means of apawl 25 pivoted at 26 in a lug 27 extending later ally from the ring 20and arranged to engage the ratchet-wheel 24 as clearly shown in Fig. 3.

Thus it will be seen that by locating a plurality of centering devicesin advance of the cutting chasers, and particularly one immediately inadvance of the chasers, the die head will place the chasers in a properposition to operate on the pipe to be threaded without anyaction on thepart of the operator to center the chasers, since there is approximately no tendency toward a lateral movement of the die stock inthe hands of the operator.

It is well-known in the art of pipe cutting, that the operator dependsentirely upon his skill in starting the cutting chasers on the pipe sothat an accurate thread may be cut thereon, and since the common pipecenterin g devices now in use are located a distance in front of thecutting chasers, a maximum amount oi? lateral movement isallowed the diehead at the end of a pipe.

The construction and arrangement of my centering devices with respect tothe cutting chasers, reduces to a minimum the lateral movement of thedie head and thereby the chasers at the end of the pipe to be threaded.

It is obvious that various changes may be resorted to in the form,construction and ar rangement of the several parts without departingfrom the spirit and scope ot' my invention, and hence I do not intend tobe limited to the details herein shown and de scribed except as they maybe specifically included in the claims.

lVhat I claim is: I

l. The combination with a stock, of one centering device located at adistance from the cutting chasers and another centering devicelocatedbetween the first named device and the cutting chasers, saidintermediate device comprising. a pluralityof swingingly movable armshaving a common operating means and a ratchet and pawl connection formaintaining said armsin a relatively fixed position.

2. The combination with a stock having a leader screw, of one centeringdevice located at a distance from the cuttingchasers and'anothercentering device carried by the leader screw located in close proximityto the cutting chasers and between the first named device and thecutting chasers, said intermediate device comprising a plurality ofswingingly movable arms having a common operating means, and a ratchetand pawl connection for maintaining said arms in a relatively fixedposition.

3. The combination with a stock, of one centering device located at adistance from the cutting chasers, said device comprising a plurality ofradially movable blocks having a common operating means, said meansbeing controlled by a ratchet and pawl con- 'nection for maintainingsaid blocks in a relatively fixed position, and another centering devicelocated between the first named device and the cutting chasers, saidintermediate device comprising a plurality of swingingly movable armshaving a common operating means, said means being controlled by aratchet and pawl connection for maintaining said arms in a relativelyfixed position.

4. The combination with a stock having a leader screw, of one centeringdevice located at a distance from'the cutting chasers, said. devicecomprising a plurality of radially movable blocks having a commonoperating means, said means being controlled by a ratchet and pawlconnection for maintaining said blocks in a relatively fixed position,and another centering device carried by the leader screw located inclose proximity to the cutting chasers and between the first nameddevice, saidintermediate device comprising aplurality of swinginglymovable arms having a common operating means, said means beingcontrolled by a ratchet and pawl connection for maintaining said arms ina relatively fixed position.

5. The combination with a stock, of a cen tering device locatedimmediately in advance of the cutting chasers, said device comprising aplurality of swingingly movable arms having a common operating means,and a ratchet and pawl connection'for maintaining said arms in arelatively fixed position.

6. The combination with. a stockhaving a leader screw, of a centeringdevice carried by the stock located immediately in advance of thecutting chasers, said device comprisa plurality of swingingly movablearms having common operating means and a ratchet and pawl connection formaintaining said arms in a relatively fixed position.

7. The combination with a stock, of a cen tering device located at adistance from the cutting chasers. said device comprising a plurality ofswingingly movable blocks having a common operating means, said meansbeing controlled by a ratchet and pawl connection for maintaining saidblocks in a relatively fixed position.

In testimony, that I claim the foregoing as my invention, I have signedmy name, this 19th day of August 1920.

JOSEPH KONIGSBERG.

